Low-end booster effect

I just got my RBI in last week, and love the versatility, but really am missing my Mesa's Parametric EQ that just gushed with deep-end sound whenever I notched it just right. I've tried a lot of different things on the RBI so far, and still can't get really even close to that dub/sub sound.
We do a lot of Dispatch/Sublime/original stuff that requires that kind of sound, so does anyone know of a pretty cost-effective effect/product that would help me out here? I've got room in my pedalboard and rack, so it'd work out either way there.

Would a BBE 362/482 do it alone, or would I need some other sort of effect?

John East's J Retro Stompbox might do it for you. It has all the same eq options as the onboard J Retro. Bass boost, treble cut/boost, bright switch, semi-parametric mid cut/boost (overlaps bass or treble frequencies).